Development of γ-fibre recrystallisation texture in medium–chromium ferritic stainless steels

Abstract

The texture development and c-fibre recrystallisation texture formation mechanism of ferritic stainless steels under different rolling processes were investigated. It was shown that the surface texture development was absolutely different from the centre texture development. In conventional rolled band, strong a-fibre was formed at the centre layer and it was weakened after hot band annealing; after cold rolling, the centre texture was characterised by sharp a-fibre and weak c-fibre with a peak at {111},110., and non-uniform c-fibre recrystallisation texture was developed. By contrast, in warm rolled band, the centre texture consisted of weakened a-fibre and sharpened c-fibre, and {111},112. became the prominent component after hot band annealing. The a-fibre and c-fibre with a peak at {111},112. were intensified at the centre texture after cold rolling, resulting in the formation of uniform c-fibre recrystallisation texture. It was indicated that the formation mechanism of c-fibre recrystallisation texture was closely dependent on hot rolling process.

Correlation between texture, earing behaviour and dissolved carbon and nitrogen

“…21 In conclusion, a strong intensity of {114}〈110〉, which is between {001}〈110〉 and {112}〈110〉, was formed. That is also in good agreement with the crystal rotation path {001} 〈110〉 → {114}〈110〉 → {112}〈110〉 which is mentioned by Gao et al 22…”

Evaluation of Intermediate Annealing on Nb-Stabilized Ferritic Stainless Steel

“…The formation of the recrystallization texture depends on the initial deformation texture 15 . As mentioned above, {111} 〈112〉 recrystallized grains nucleate in {111}〈110〉 recovery grains or vice-versa 10 . In the present study, it was observed that the {111}〈110〉 component was more intense after direct rolling than with an intermediate annealing for 80% cold rolling (Fig.…”

“…Yazawa et al 11 reported that the r ̅ value is related to the γ-fiber in the recrystallization texture. Furthermore, the enhancement and uniformity of the γ-fiber is essential in order to improve the r ̅ value [10][11][12] .…”

“…Huh and Engler 7 cited that an improvement in formability can be obtained by controlling the crystallographic texture. Control methods for the improvement of the γ-fiber recrystallization texture have been attempted by some approaches, such as refinement of the hot rolled microstructure, annealing of the hot rolled bands, optimization of cold rolling, intermediate annealing in cold rolling, and reduction of carbon in a solid solution [10][11][12] .…”